static String Send(String apiName, String apiVersion, Dictionary<String, String> dict)

        {

            HttpWebRequest request = WebRequest.Create(URL) as HttpWebRequest;

            request.Method = "POST";

            request.ContentType = "application/json";

            // 设置请求参数

            dict.Add("_api_access_key", AK);

            dict.Add("_api_name", apiName);

            dict.Add("_api_version", apiVersion);

            // 对参数进行字典序排序

            List<KeyValuePair<string, string>> lst = new List<KeyValuePair<string, string>>(dict);

            lst.Sort(delegate (KeyValuePair<string, string> source, KeyValuePair<string, string> target)

            {

                return source.Key.CompareTo(target.Key);

            });

            StringBuilder signBuilder = new StringBuilder();

            StringBuilder paramBuilder = new StringBuilder();

            // 拼写请求字串

            foreach (KeyValuePair<string, string> item in lst)

            {

                string key = item.Key;

                string value = item.Value;

                // 签名字串

                signBuilder.Append("&").Append(key).Append("=").Append(value);

                //value = Server

                if (HEADERS.Contains(key))

                {

                    request.Headers[key] = value;

                }

                else

                {

                    paramBuilder.Append("&").Append(key).Append("=").Append(value);

                }

            }

            if(paramBuilder.Length>1) paramBuilder.Remove(0, 1);

            signBuilder.Remove(0, 1);

            string signStr = signBuilder.ToString();

        }